[Laszlo-dev] I really thought I understood classroot, but I was wrong

[Henry Minsky]

classroot is bound in all the children, but it's not bound in the root
instance.
So, you could do


<canvas debug="true">
<class name="myclass">
   <attribute name="button_label" type="text" value="button"/>
   <handler name="onclick">
     this.handleclick()
   </handler>

   <method name="handleclick">
     Debug.write("this = " + this);
   </method>
   <button name="b1" text="${parent.button_label}"
onclick="Debug.write('classroot
= ' + classroot); parent.handleclick()" />
</class>

<class name="another_class" extends="myclass"/>

<myclass id="foo">
   <another_class id="bar" button_label ="another button" y="25">
      <method name="handleclick">
        Debug.write("this = " + this);
      </method>
  </another_class>
</myclass>
</canvas>


On 1/30/07, John Sundman <jsundman at laszlosystems.com> wrote:
>
> Why does clicking on the child button report that classroot is null?
> How do I get it to show a real classroot?
>
> <canvas debug="true">
> <class name="myclass">
>     <attribute name="button_label" type="text" value="button"/>
>     <handler name="onclick">
>       this.handleclick()
>     </handler>
>
>     <method name="handleclick">
>       Debug.write("this = " + this);
>       Debug.write("classroot= " + classroot);
>     </method>
>     <button text="${parent.button_label}" onclick="parent.handleclick
> ()" />
> </class>
>
> <class name="another_class" extends="myclass"/>
>
> <myclass>
>     <another_class button_label ="another button" y="25">
>        <method name="handleclick">
>          Debug.write("this = " + this);
>          Debug.write("another_class classroot= " + classroot);
>        </method>
>    </another_class>
> </myclass>
> </canvas>
>
> Thanks,
>
> jrs
>



-- 
Henry Minsky
Software Architect
hminsky at laszlosystems.com
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